Which one is best? Bench press smith machine, bench press dumbbell,

D) all

dumbbell

>>40078531
Decline fat bar suicide grip banded guillotine press.

>>40078531
Smith machine is always inferior to any free weight movement.
Incline targets your upper pec and shoulders more than normal bench, that's about it. You're also more likely to get a rotator cuff injury on incline, I believe

The others are debatable, but the Smith machine shouldn't even be listed here.